<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body {
            margin: 0;
            background-color: #333333;
        }
    </style>
</head>
<body>
<script src="jquery.min.js"></script>
<script>
    setInterval(function () {
        let img = $("<img src='snow.png'>")
        let size = parseInt(Math.random() * 21) + 20;
        img.css("width", size + "px");
        img.css("position", "absolute");
        let w = $(window).width();
        let h = $(window).height();
        let left = parseInt(Math.random() * (w - size));
        img.css("left", left + "px")
        $("body").append(img);
        img.animate({"top": (h - size) + "px"}, size * 100).fadeOut(1000, function () {

            img.remove();
        })
    }, 30)
</script>
</body>
</html>